static void
test_chars(void)
{
assert(char_to_file('a') == file_a);
assert(char_to_file('b') == file_b);
assert(char_to_file('h') == file_h);
assert(char_to_file('A') == file_a);
assert(char_to_file('B') == file_b);
assert(char_to_file('H') == file_h);
assert(char_to_rank('1', white) == rank_1);
assert(char_to_rank('2', white) == rank_2);
assert(char_to_rank('3', white) == rank_3);
assert(char_to_rank('4', white) == rank_4);
assert(char_to_rank('5', white) == rank_5);
assert(char_to_rank('8', white) == rank_8);
assert(char_to_rank('1', black) == rank_8);
assert(char_to_rank('2', black) == rank_7);
assert(char_to_rank('3', black) == rank_6);
assert(char_to_rank('4', black) == rank_5);
assert(char_to_rank('5', black) == rank_4);
assert(char_to_rank('8', black) == rank_1);
assert(index_to_file_ch(0) == 'h');
assert(index_to_file_ch(1) == 'g');
assert(index_to_file_ch(7) == 'a');
assert(index_to_file_ch(63) == 'a');
assert(index_to_rank_ch(0, white) == '8');
assert(index_to_rank_ch(1, white) == '8');
assert(index_to_rank_ch(8 + 7, white) == '7');
assert(index_to_rank_ch(63, white) == '1');
assert(index_to_rank_ch(0, black) == '1');
assert(index_to_rank_ch(1, black) == '1');
assert(index_to_rank_ch(8 + 7, black) == '2');
assert(index_to_rank_ch(63, black) == '8');
assert(piece_to_char(queen) == 'q');
assert(square_to_char(queen, white) == 'Q');
assert(square_to_char(queen, black) == 'q');
assert(is_file('f'));
assert(is_file('F'));
assert(!is_file('4'));
assert(!is_file('i'));
assert(!is_file(' '));
assert(is_rank('1'));
assert(is_rank('6'));
assert(!is_rank('9'));
assert(!is_rank('0'));
assert(!is_rank('a'));
assert(!is_rank(' '));
}
static char*
FEN_print_board(const struct position *pos, char *str, enum player turn)
{
int empty_count;
for (int rank = rank_8; ; rank += RSOUTH) {
empty_count = 0;
for (int file = file_a; is_valid_file(file); file += EAST) {
int i = ind(rank, file);
if (turn == black)
i = flip_i(i);
enum piece p = position_piece_at(pos, i);
enum player player = position_player_at(pos, i);
if (p != nonpiece) {
if (empty_count > 0) {
*str++ = '0' + (char)empty_count;
empty_count = 0;
}
if (turn == black)
player = opponent_of(player);
*str++ = square_to_char(p, player);
}
else {
++empty_count;
}
}
if (empty_count > 0)
*str++ = '0' + empty_count;
if (rank == rank_1)
return str;
else
*str++ = '/';
}
}
